content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import java.util.Objects;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.subscriptions.*;
  
  /**
   * If the upstream signals an error, switch over to the next Solo
   * and emits its signal instead.
   * @param <T> the value type
   */
  final class SoloOnErrorResumeNext<T> extends Solo<T> {
  
      final Solo<T> source;
  
      final Function<? super Throwable, ? extends Solo<T>> errorHandler;
  
      SoloOnErrorResumeNext(Solo<T> source, Function<? super Throwable, ? extends Solo<T>> errorHandler) {
          this.source = source;
          this.errorHandler = errorHandler;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          source.subscribe(new OnErrorReturnItemSubscriber<>(s, errorHandler));
      }
  
      static final class OnErrorReturnItemSubscriber<T> extends DeferredScalarSubscription<T>
      implements Subscriber<T> {
  
          private static final long serialVersionUID = -7631998337002592538L;
  
          final Function<? super Throwable, ? extends Solo<T>> errorHandler;
  
          final NextSubscriber nextSubscriber;
  
          Subscription upstream;
  
          OnErrorReturnItemSubscriber(Subscriber<? super T> downstream, Function<? super Throwable, ? extends Solo<T>> errorHandler) {
              super(downstream);
              this.errorHandler = errorHandler;
              this.nextSubscriber = new NextSubscriber();
          }
  
          @Override
          public void onSubscribe(Subscription s) {
              if (SubscriptionHelper.validate(this.upstream, s)) {
                  this.upstream = s;
  
                  downstream.onSubscribe(this);
  
                  s.request(Long.MAX_VALUE);
              }
          }
  
          @Override
          public void onNext(T t) {
              value = t;
          }
  
          @Override
          public void onError(Throwable t) {
              Solo<T> sp;
  
              try {
                  sp = Objects.requireNonNull(errorHandler.apply(t), "The errorHandler returned a null Solo");
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  downstream.onError(new CompositeException(t, ex));
                  return;
              }
  
              sp.subscribe(nextSubscriber);
          }
  
          @Override
          public void onComplete() {
              T v = value;
              if (v != null) {
                  complete(v);
              } else {
                  downstream.onComplete();
              }
          }
  
          @Override
          public void cancel() {
              super.cancel();
              upstream.cancel();
              SubscriptionHelper.cancel(nextSubscriber);
          }
  
          final class NextSubscriber extends AtomicReference<Subscription>
          implements Subscriber<T> {
  
              private static final long serialVersionUID = 5161815655607865861L;
  
              @Override
              public void onSubscribe(Subscription s) {
                  if (SubscriptionHelper.setOnce(this, s)) {
                      s.request(Long.MAX_VALUE);
                  }
              }
  
              @Override
              public void onNext(T t) {
                  OnErrorReturnItemSubscriber.this.onNext(t);
              }
  
              @Override
              public void onError(Throwable t) {
                  downstream.onError(t);
              }
  
              @Override
              public void onComplete() {
                  OnErrorReturnItemSubscriber.this.onComplete();
              }
          }
      }
  }
  